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An explainer on video aspect ratios in 2026: what 16:9, 9:16, 1:1, 4:5 and 3:4 mean, the common resolutions for each, which ratios YouTube, TikTok, Instagram, Facebook and LinkedIn accept, safe zones for captions, four ways to convert between ratios (crop, letterbox, blur fill, auto-reframe), how to go from 16:9 to 9:16 without cutting off faces, and common mistakes.